rock wool
Rockwool Pipe Insulation for Steam Pipes
Pre-formed rockwool pipe insulation sections for steam pipes, HVAC and industrial piping. Rigid pipe insulation material rated 750C, Class A1 non-combustible.
rock wool
Rockwool Insulation Slabs — Rock Wool Board
Basalt rockwool insulation slabs (also rock wool board) — Class A non-combustible rockwool material. Fire-safe, water-repellent, sound-absorbing.
- Density
- 60-150 kg/m³
- Raw Material
- Basalt
- Thickness
- 25-150mm
- Thermal Conductivity
- ≤ 0.044 W/(m·K)
Overview
- ✦ Low thermal conductivity
- ✦ Class A non-combustible
- ✦ Excellent sound absorption
- ✦ Water resistant
Rock Wool Board — Rigid Basalt Insulation for Fire, Thermal & Acoustic Performance
Rock wool board (also written rockwool or called mineral wool board / basalt wool board) is a rigid, high-density rockwool material supplied as standard rockwool insulation slabs. In legacy trade literature it is sometimes referenced as fire wool for its non-combustible character. Manufactured from natural basalt melted above 1450°C and spun into mineral fibers, then cured with a thermosetting binder, the panels deliver fire-safe, low-smoke thermal and acoustic insulation for building envelopes, industrial equipment, and power infrastructure.
Key Properties
- Fire safety (A1 non-combustible): inorganic basalt fibers do not burn, melt, or release toxic smoke; oxygen index ≥50, smoke toxicity class t0, fire resistance limit ≥3 hours — the defining property that makes rockwool a fire wool-grade insulation material.
- Thermal insulation: thermal conductivity 0.034–0.042 W/(m·K); stable long-term performance with no aging decay.
- Acoustic performance: open-porous structure provides high sound absorption for facades, partitions and HVAC ducts.
- Hydrophobic & durable: water repellency ≥98.5%, water absorption by mass ≤1%, resists humidity in outdoor and marine use.
- Mechanical strength: compressive strength ≥40 kPa (≥80 kPa for high-density grades), tensile strength perpendicular to face ≥10 kPa.
- Chemically stable & eco-friendly: free of asbestos, formaldehyde and CFC; low-chloride grade (Cl⁻ ≤10 mg/kg) protects austenitic stainless steel; 100% recyclable.
Common Forms
Standard rockwool insulation slabs are produced in thicknesses of 25–150 mm and densities from 60 to 200 kg/m³, supplied as rigid panels (slabs), boards, and sandwich-panel cores. Rockwool material in slab form is the most widely specified format for building envelopes, industrial equipment insulation, structural fire barriers in substations, energy-storage station compartmentation, and petrochemical facilities.
Part of the rock wool product family.
Key features
- ✓ Low thermal conductivity
- ✓ Class A non-combustible
- ✓ Excellent sound absorption
- ✓ Water resistant
- ✓ High compressive strength
- ✓ Durable
- ✓ Corrosion-resistant
- ✓ Asbestos-free
Typical applications
- Building exterior wall insulation (ETICS/EIFS)
- Fire barrier & firestop walls
- Flat & metal roof insulation
- Curtain wall cavity filling
- Partition walls and ceilings
- HVAC duct insulation
- Petroleum/chemical boiler & furnace insulation
- Power/metallurgy equipment insulation
- Substation, cable tray & cable trench fire barrier
- Energy storage station fire compartmentation
- Rockwool insulation slab for storage tanks
- Marine & offshore rockwool insulation slabs
- Rockwool fire barrier for substations & cable trenches
Technical specs
- Density
- 60-150 kg/m³
- Raw Material
- Basalt
- Thickness
- 25-150mm
- Thermal Conductivity
- ≤ 0.044 W/(m·K)
- Combustion
- Class A Non-combustible
- Asbestos
- 100% Non-Asbestos
- Max Service Temperature
- 600–700℃ (short-term 1000℃+)
- Compressive Strength
- ≥40 kPa (≥80 kPa high-density)
- Tensile Strength (perp. to face)
- ≥10 kPa
- Water Repellency
- ≥98.5%
- Water Absorption (by mass)
- ≤1%
- Chloride Content
- ≤10 mg/kg (low-chloride grade)
- Fire Resistance Limit
- ≥3 hours
- Sound Absorption
- High NRC (open-porous)
Last updated: August 14, 2026
Frequently asked
What temperature can rockwool insulation withstand? +
Rockwool insulation can withstand temperatures up to 750°C for standard grades. It is classified as a non-combustible material (Euroclass A1, ASTM E84 Class A), making it ideal for structural fire protection, industrial pipe insulation, and building envelope applications.
Does rock wool absorb water? +
No. Our rock wool products feature hydrophobic treatment with water repellency exceeding 98%. Unlike some insulation materials, rock wool maintains its thermal performance even in high-humidity environments. This makes it particularly suitable for outdoor pipework and marine applications.
Is rockwool environmentally friendly? +
Yes. Rockwool is manufactured from volcanic basalt rock — an abundant natural resource. It contains up to 75% recycled content, is fully recyclable at end of life, and contributes to building energy efficiency by reducing heat loss. It is RoHS and REACH compliant.
What density of rockwool insulation should I use? +
The optimal density depends on your application: 60–80 kg/m³ for general thermal insulation of tanks and vessels, 80–120 kg/m³ for pipe insulation and HVAC ductwork, 100–150 kg/m³ for load-bearing or structural applications, and 150+ kg/m³ for high-compression industrial flooring and sandwich panels.
What is rockwool board used for in construction? +
In buildings it is used for external wall insulation systems (ETICS/EIFS), fire barrier and firestop walls, flat and metal roof insulation, curtain wall cavity filling, partition walls, suspended ceilings and HVAC duct insulation — combining A1 fire safety with thermal and acoustic performance.
Can rockwool board be installed as a fire barrier? +
Yes. With an A1 non-combustible rating and a fire resistance limit of 3 hours or more, rigid rockwool board is widely used as fire barrier and firestop walls, cable tray / cable trench fire separation, and energy storage station compartmentation to stop fire spread.
What are rockwool insulation slabs and where are they used? +
Rockwool insulation slabs are rigid, high-density panels manufactured from basalt fibers, typically supplied in thicknesses of 25–150 mm and densities from 60 to 200 kg/m³. They are widely used for external wall insulation (ETICS/EIFS), fire barrier walls, flat and metal roofs, curtain wall cavities, partition walls, HVAC ductwork, and structural fire protection in substations, energy storage stations, and petrochemical facilities.
Is rockwool a fire-safe insulation material? +
Yes. Rockwool achieves Euroclass A1 / ASTM E84 Class A non-combustible rating, the highest possible fire-safety classification for an insulation material. Sometimes referenced in legacy trade literature as fire wool, it will not burn, melt, or release toxic smoke, with a fire resistance limit of 3 hours or more — making rockwool material the specification of choice for structural fire barriers and life-safety insulation.
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